man fmt_8long (3): write an octal ASCII representation of an unsigned long integer

SYNTAX

#include <fmt.h>

size_t fmt_8long(char *dest,size_t source);

fmt_8long writes an ASCII representation ('0' to '7', base 8) of source to dest and returns the number of bytes written.

fmt_8long does not append \0.

If dest equals FMT_LEN (i.e. is zero), fmt_8long returns the number of bytes it would have written.

For convenience, fmt.h defines the integer FMT_8LONG to be big enough to contain every possible fmt_8long output plus \0.